Visual space can be accessed by introspection, by interrogation, or by suitable experimental procedures which allow relative location as well as some structural properties to be assessed, even quantitatively.

One can freely move in space but not in time.

walk_run_earth_sky

aView2011Digital Photography20" x 26"

The walk was long, and I was tired. I stopped to rest…to lie down in the grass. The world abruptly changed. My perspective of the reality of the physical world broadened in scope, with the barely visible becoming an evocative reality.

aFog2011Digital Photography16.5" x 22"

I woke up to a morning of fog...a thick mist obscuring the glow of autumn. I knew that underneath the haze, the world was radiant.

In physics, a wave is a disturbance or oscillation that travels through space and matter, accompanied by a transfer of energy. Wave motion transfers energy from one point to another, often with no permanent displacement of the particles of the medium. They consist of oscillations or vibrations around almost fixed locations. Waves are described by a wave equation which sets out how the disturbance proceeds over time.

HereThere22012Digital Photography44" x 16.5"

In physics, spacetime (also space–time, space time or space–time continuum) is any mathematical model that combines space and time into a single interwoven continuum. Time cannot be separated from the three dimensions of space, because the observed rate at which time passes for an object depends on the object's velocity relative to the observer and also on the strength of gravitational fields, which can slow the passage of time for an object as seen by an observer outside the field.